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I am trying to determine census tract changes between 1980 and 1990. Can you point me to something?
The easiest tool is the 1990 version of the Mable Geocorr look-up. It is located here:
It has 1980 and 1990 census geography, so to see if there are any changes in census tract boundaries, select your state, and then choose 1980 tract for the "source" and 1990 tract for the "target." For Queens county, New York (county 081), you can see that the 1980 census tract 142 has been split into 142.01 and 142.02 in 1990. Or that 1980 census tract 664 in Queens county is 664.98 in 1990.
If you need to compare 1990 and 2000 census tract changes, use the 2000 version of the same tool: